Multiply (3-a) by (5-2a)?

2 Answers
Yiyun W.
Feb 19, 2018

#15 - 11a + 2a^2#

Explanation:

#(3 - a)(5 - 2a)# expanded = #15 - 6a - 5a + 2a^2#
add like terms and you get #15 - 11a + 2a^2#

Crater M.
Feb 19, 2018

#2a^2-11a+15#

Explanation:

#(3-a)*(5-2a)#
Multiply each term in the left bracket by each term in the right bracket.
#a# times a number looks like this #a*3=3a#
If you multiply it by itself its like this #a*a=a^2#
so

#3*5 =15#

#3*(-2a)=-6a#

#(-a)*5=-5a#

#(-a)*(-2a)=2a^2#

Arrange in order of #a^2+a+##

#2a^2-6a-5a+15#
#2a^2-11a+15#

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